Geodesic
Kazhdan Constants and Matrix Coefficients of Sp(n, R)
Journal of Lie theory, Tome 13 (2003) no. 1, pp. 133-154.

Voir la notice de l'article provenant de la source Heldermann Verlag

An infinitesimal Kazhdan constant of  Sp(2, R)  is computed. The methods used to prove this can also be employed to determine a quantitative estimate of the asymptotics of the matrix coefficients of  Sp(n, R)  in an elementary manner. An application of the result gives explicit Kazhdan constants for  Sp(n, R) , n ≥ 2. 
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     author = {M. Neuhauser },
     title = {Kazhdan {Constants} and {Matrix} {Coefficients} of {Sp(n,} {R)}},
     journal = {Journal of Lie theory},
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     url = {http://geodesic.mathdoc.fr/item/JLT_2003_13_1_JLT_2003_13_1_a7/}
}
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M. Neuhauser . Kazhdan Constants and Matrix Coefficients of Sp(n, R). Journal of Lie theory, Tome 13 (2003) no. 1, pp. 133-154. http://geodesic.mathdoc.fr/item/JLT_2003_13_1_JLT_2003_13_1_a7/